Fluke 732C DC Voltage Reference Standard

The Fluke 732C DC Voltage Reference Standard is a portable, battery-powered voltage source for disseminating and maintaining DC reference standards in primary and secondary calibration laboratories. It delivers three selectable output voltages - 10 V, 1 V, and 0.1 V DC - each traceable to national standards and the Fluke Calibration 10 V Josephson Array. Engineered for field portability and laboratory stability, the 732C combines long battery runtime with temperature-stable outputs and comprehensive power options for continuous or mobile operation.

Technical Specifications

Output Voltages & Stability

• 10 V DC: ±2 µV/V per year (Base models); ±1 µV/V per year (Select models)


• 1 V DC: ±3 µV/V per year


• 0.1 V DC: ±9.8 µV/V per year


• Stability specifications apply at Tcal ±1 °C with IN CAL indicator active


• Outputs referenced to common VCOM binding post Temperature Performance


• 10 V output temperature coefficient: 0.04 µV/V-°C


• Accounts for drift when operating outside calibration temperature Power & Battery


• Internal battery: ≥72 hours minimum runtime at 23±5 °C with 0–0.1 mA total output current drain


• External DC input (rear panel): 12 V to 15 V DC, ≥300 mA capacity for indefinite operation


• AC line input: 100 V (90–110 V), 120 V (108–132 V), 220 V (198–242 V), 240 V (216–264 V) at 50/60 Hz


• AC line current at 120 V: typically 0.13 A


• Battery charging time: 10,000 MΩ to earth/chassis ground or AC line, shunted by <1000 pF


• All outputs short-circuit protected indefinitely


• 10 V output: rated for maximum 50 mA continuous at ≤220 V DC

Key Features

• Three independently accessible output voltage levels


• Selectable Select models offer 2× greater stability at 10 V output


• Long-term stability dominates uncertainty over 30+ day periods


• Field-deployable with minimal power dependencies


• High source impedance isolation for sensitive measurement environments

Typical Applications

• Primary and secondary reference standard maintenance


• Calibration laboratory voltage dissemination


• Portable on-site calibration verification


• DC voltage standard traceability chain validation

Compatibility & Integration The 732C accepts multiple AC line voltages worldwide and supports external 12–15 V DC supplies for laboratory or mobile benchtop integration. Binding post outputs enable direct connection to high-impedance calibration instruments and precision voltmeters.